Which mechanisms related to the reticulorumen can cause secondary free gas bloat?

• A. Adhesions preventing eructation
• B. Damage to innervation of reticulorumen
• C. Both adhesions and damage to innervation
• D. None of the above

Answer: (C)

Secondary free gas bloat occurs when eructation is blocked even though gas is being produced, so the gas cannot be expelled from the reticulorumen. There are two mechanisms related to the reticulorumen that can cause this. First, adhesions can create a mechanical barrier that limits gas from moving toward the esophagus during eructation, so gas builds up in the forestomach. Second, damage to the innervation of the reticulorumen, particularly vagal nerve disruption, impairs ruminal motility and the eructation reflex, reducing or stopping gas expulsion. Because either a physical obstruction or a neurogenic reduction in motility can prevent eructation, both mechanisms can lead to secondary free gas bloat.